Looking to add an Ottoman empire mauser whats my options?

Ive been looking at Turkish mausers & it seems they've all been rearsenaled. Is there something I can keep an eye out for to separate the ones made later by the turks?

thanks

Couple of options to look out for GEW 88 which is not a Mauser but would most certainly been used by the Ottoman Empire. A Mauser in 7.65 which are out there but very hard to find and a GEW 98. Most everything else has been reworked to the 1938 standard.